I understood Sparkle to be an aircraft warning system that uses bright laser strobe light type colors red and green from ground station139.700 (AM) - BLACKJACK-1 in DC area working PANTHER (assuming this is JADOC Ground Station) SPARKLE system testing
There's a frequency: 139.150 Joint Air Defense Operations Center (JADOC) Bolling AFB Wash DC-Sparkle System;
that's also shared with DC ANG 121st FS and NJ ANG but I've never heard any Sparkle system related activity on it.
I've been trying to find a good explanation of what the Sparkle system does. Anyone?
to warn off small low flying aircraft.. Lights up your cockpit without really blinding you.Gets your attention quickly.
I imagine they test it out at times on local DC practice intercepts.. Light up a Cessna CAP plane perhaps.